Building Kafka Listener Containers

In event-driven systems, producers send events, and consumers react to them. Spring Boot makes it easy to build Kafka consumers.

We'll learn how to create methods that automatically listen for and process messages from Kafka topics using the @KafkaListener annotation.

The @KafkaListener annotation is the core of consuming messages in Spring Boot. You place it on a method, telling Spring which Kafka topic(s) to listen to.

• It automatically sets up the necessary infrastructure.
• The method parameter receives the message payload.
• You must specify a topics and groupId.